• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2017, Vol. 38 ›› Issue (8): 33-.doi: 10.3969/j.issn.1000-7229.2017.08.005

• 设备开发与配置技术 • 上一篇    下一篇

混合直流输电系统直流故障处理策略比较分析#br#

陆翌1,李继红1,裘鹏1,肖晃庆2,刘高任2,徐政2#br#   

  1. (1.国网浙江省电力公司电力科学研究院,杭州市 310014;2. 浙江大学电气工程学院,杭州市 310027)
  • 出版日期:2017-08-01
  • 作者简介:陆翌(1979),男,博士,高级工程师,主要研究方向为高压直流输电和柔性直流输电及大功率电力电子技术分号 李继红(1964),男,硕士,教授级高级工程师,主要研究方向为电网调度运行、电力系统运行与分析分号 裘鹏(1985),男,工程师,本文通信作者,主要研究方向为直流输电和柔性直流输电; 肖晃庆(1990),男,博士研究生,研究方向为直流输电与柔性交流输电分号 刘高任(1990),男,博士研究生,研究方向为直流输电与柔性交流输电分号 徐政(1962),男,教授,博士,主要研究方向为大规模交直流电力系统分析、直流输电与柔性交流输电、风力发电技术与风电场并网技术。
  • 基金资助:
    国家电网公司科技项目(5211011600R4)

Analysis and Comparison of DC Fault Handling Strategies for Hybrid HVDC System

LU Yi1, LI Jihong1, QIU Peng1, XIAO Huangqing2, LIU Gaoren2, XU Zheng2#br#   

  1. (1. Electric Power Research Institute of State Grid Zhejiang Electric Power Company, Hangzhou 310014, China;
    2. College of Electric Engineering, Zhejiang University, Hangzhou 310027, China)
  • Online:2017-08-01
  • Supported by:
     

摘要: 摘要:基于电网换相换流器( line commutated converter, LCC) 以及模块化多电平换流器(modular multilevel converter, MMC))的混合型高压直流输电技术是实现远距离大容量输电的有效技术手段。为了快速清除直流短路故障,主要有2种实现方法:一是逆变侧换流器采用具有直流故障自清除能力的子模块,如全桥型子模块及箝位双子模块;二是在逆变侧直流出口加装大功率二极管以切断故障后的电流流通通路。该文通过研究不同直流故障处理策略的物理机理及控制流程,对其可行性及适用性进行深入研究。通过在PSCAD/EMTDC中搭建典型模型,考察直流故障下的系统响应特性,对不同处理策略下的系统暂态特性进行综合比较。最后,对基于全桥型子模块的不闭锁穿越式直流故障处理策略进行了仿真验证,仿真结果表明此种策略不适用于真双极直流系统,无法实现直流短路故障的有效清除。

关键词: 电网换相换流器(LCC), 模块化多电平换流器(MMC), 混合直流输电系统, 直流故障, 不闭锁穿越式直流故障处理策略

Abstract: ABSTRACT: The hybrid high voltage direct current (hybrid HVDC) transmission system based on line commutated converter (LCC) and modular multilevel converter (MMC) is a feasible solution for long distance bulk power transmission. In order to handle the DC short-circuit fault, two kinds of methods can be adopted. The first one is to use the sub-modules (SMs) which have the capability of DC-fault clearance in inverter side converter, such as full-bridge SMs and clamp-double SMs. The second one is to arrange high-power diode at the MMC DC port to cut off the current flow path after the fault. Through analyzing the physical mechanism and control flow of different DC fault handling strategies, this paper studies its feasibility and applicability. The typical testing system is built in PSCAD/EMTDC, the system response under DC fault is investigated, and the system transient characteristics under different strategies are compared. In addition, the non-block DC-fault-handling strategy based on full-bridge SMs is simulated and verified. The results show that this kind of solution is not suitable for the bipolar HVDC system and the DC fault current can not be blocked thoroughly.

Key words:  line commutated converter (LCC), modular multilevel converter (MMC), hybrid high voltage direct current transmission system, DC fault, non-block DC-fault-handling strategy

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